Separating apparatus



y 1941- T. B. ALLARDICE 2,290,664

SEPARAIING APPARATUS Filed June 13, 1940 ig- INVENTOR THOMAS B. ALLARO/CE BY ATTORNEY which issued Dec. 12, 1939.

Patented July 21, 1942 surname mm'rns I Thomas B. Auaramnrtumm met, N. 1., f Application am n, 1940, Serial-No. 340,297

This invention relates to apparatus for sepapower plants. I

The present invention is a modification of and rating solid particles from gases and relates more particularly to apparatus for separating-J solid particles from flue gases from. for example, steam 5.0laims. (01.18341) vention and is taken along thelines of Fig.

2,- and 1 Fig. 2 1s a vertical section along the lines'2--2 fof Fix. 1.

in some respects is an improvement of, that disclosed and claimed in my Patent No. 2,182,862,

In the separating apparatus of my said patent, and as illustrated more particularly by Figs. 1 to 3 inclusive of the drawing thereof, the dust laden gases enter a cylindrical casing through 'a tangential inlet and are caused to flow as a stream having a path of gradually diminishing area, gas being continuously separated from the stream and caused abruptly to change its direction at the points of separation to free it from the dust particles carried thereby. The said flow path terminates at its narrowest portion in a passage which conveyed the gas from the separating chamber. The present invention differs from the embodiment of my said patent by providing as one feature, for recirculating the gas through the separating chamber, the degree of recirculation being controlled by a damper. This results in a larger recovery of solid particles from the gas.

j -'The-casing It has the tangential inlet ii and has a curved inner wall formed by the plate I: and theplurality of spaced baiile plates I3. This curved wall is spaced from the walls of the casing ill to form a gas passage which progressively -decreases'in width from the tangential inlet to its narrowed point adjacent the inlet where the pivoted adjustable damper I1 is located. "The damper il'extends'across the flow path at its narrowedipoint and serves to vary the volume of gas recirculated through the flow path. The inlet extends from the upper wall It to the lower wall l5 and the damper extends the same distance.

The whirl chambers III are formed on the ex terior of the casing In and have the lips I! which extend into the gas flow path to skim oi! the heavier solid particles which are thrown off by centrifugal force against the inner walls of the casing. T'The chambers l8 extend from the upper wall llof the casing below the plates |3,;to the inlets 20 between the cylinder l6 and the hopper 2|. One or more of the chambers l8 may be provided.

Another feature of this invention resides in I ery of the flow path with skimmers extending into the flow path for removing the larger solid particles thrown out by centrifugal force.

Another feature of this invention resides in providing the floor of the separating chamber in a spiral communicating with the hopper underneath for providing for the disposal of the solid particles which fall out of the gas upon the floor.

Another feature of the invention resides in providing in a converging lower hopper beneath the separating chamber, an inner chamber having its walls spaced from the walls of the hopper for separating the heavier solid particles falling adjacent the periphery of the hopper, and the lighter particles falling in the center of the hopper. This aids in maintaining spiral flow; without eddies, in the hopper.

The object of the invention is to increase the efliciency of separation of solid particles from gases.

The invention will now be described with reference to the drawing, of which:

Fig. 1 is a horizontal section through one emder 22 with lower flared walls 23. The open upper end of the. cylinder 22 extends through the upper wall l5 of the cylinder it through a bodiment of a separator according to this incircular aperture therein. The cylinder 22 serves as willbe explained, to guide the gas from below the plates l3 into the central space between the plates for discharge with the air entering the said central space between .the plates l3, into the outlet connection 24.

The plate 25 extends spirally around the cylinder l6, beginning in the inlet II and terminating at the other side of the flow path at 26 and serves as a spiral floor for conveying those heavy solid particles which fall thereon from the gas, in

spiral flow to be discharged into the hopper 2|. The passage 30 spaces the plate 25 from the inner walls ofthe casing Ill and provides a gas passage past the plate.

The hopper 2| in the illustrated embodiment is conical and has spaced from its inner walls and supported therefrom by the brackets 28, the inner hopper 29 having walls parallel to and spaced from the inner walls of the outer hopper.

The heavier solid particles from the inlets 20 of the whirl chambers I8 fall into the hopper 2| and the curved inner wall formed by the plate l2 and the baflie plates l3, and the heaviest solid particles are thrown out against the inner wall of casing i0 and are skimmed off by the lips IQ of the chambers l8 and fall through the chambers l8 and out the outlets into the hopper At each plate 13 a portion of the gas has its direction abruptly changed to flow between adjacent plates under the influence of the suction in the passage between the plates, and these changes in direction cause the solid particles remaining in the gas to be thrown out and to fall upon the spiral plate from which due to the whirling action and the downwardly extending angle 'of inclination of the plate, they are whirled oil? the plate 25 into the hopper 2|.

.By adjusting the damper l1 towards open position, recirculation of some of the gas is permitted and increased recovery is obtained by recirculating the gas again through the separating passages. The damper I1 is preferably adjusted to a position which observations show result in maximum efiiciency.of collection for a particular installation, and its most eflicient position depends upon the degree of concentration of solid particles, the fineness of the particles, the size of the fan, the resistance to the gas flow and possibly other factors peculiar to individual installation.

The gas from the outlet 20 and any other gas entering the space between the hopper and the cylinder I6 passes through the inner cylinder 22 into the space at the interior of the curved wall formed by the baflie plates I 3 and the plate I 2, and then out the connection 24, together with the gas passing between the plates I 3, as clean gas.

While the several features of this invention have been described and illustrated by the drawing, each feature has its individual advantage which may independently be utilized. The invention is not therefore to be interpreted as limited to the inclusion of all of said features.

While one embodiment has been described for the purpose of illutration, it should be understood that the invention is not limited to the exact apparatus and arrangement of apparatus illustrated as modifications thereof may be suggested by those skilled in the art without departure from the essenc of the invention.

What is claimed is:

1. Apparatus for separating solid particles from gas, comprising a casing having an inlet and an outlet and arranged to provide a curved flow path for the gas entering said inlet, a plurality of spaced baiiie plates around the inner periphery of said path and so arranged with respect to said casing that said path has progressively diminishing flow area, said plates being so disposed that portions of the gas flowing through said path are separated and caused abruptly to change their direction of flow to pass to said outlet, said path at its narrowest portion connecting with said inlet whereby a portion of said gas may be recirculated through said path, a damper in said narrowest portion for varying the volume of recirculated gas, and a hopper below said path and connecting with same for receiving the solid particles separated from said gas.

2. Apparatus for separating solid particles from gas, comprising a casing having a tangential inlet and an outlet and arranged to provide a curved flow path for the gas entering said inlet, a plurality of spaced balile plates around the inner periphery of said path, said plates being so disposed that portions of the gas flowing through said path are separated and caused abruptly to 7 change their direction of flow to pass to said outlet, said path connecting with said inlet whereby a portion of said gas may be recirculated through said path, a damper in said path adjacent its connection with said inlet for varying the volume of recirculated gas, and a hopper below said path and connecting withsame for receiving the solid particles separated from said gas.

3. Apparatus for separating solid particles from gas, comprising a casing having an inlet and an outlet and arranged to provide a curved flow path for the gas entering said inlet, a plurality of spaced baiiie plates around the inner periphery of said path and so arranged with respect to said casing that said path has progressively diminishing flow area, said plates being so disposed that portions of the gas flowing through said path are separated and caused abruptly to change their direction of flow to pass to said outlet, said path at its narrowest portion connecting with said inlet whereby a portion of said gas may be recirculated through said path,.a damper in said narrowest portion for varying the volume of recirculated gas, a hopper below said plates, said casing having an opening therein alongside said plates at the outer periphery of said flow path for receiving solid particles thrown out of said gas, and means forming a chamber enclosing said opening and communicating with said hopper below said plates for guiding solid particles from said opening into said hopper.

4. Apparatus for separating solid particles from gas, comprising a casing having a tangential inlet and an outlet and arranged to provide a curved flow path for the gas entering said inlet, a plurality of spaced baflle plates around the inner periphery of said path and so arranged with respect to said casing that said path has progressively diminishing flow area, said outlet extending substantially axially of said curved flow path, said plates being so disposed that portions of the gas flowing through said path are separated and caused abruptly to change their direction of flow to pass to said outlet, said path at its narrowest portion connecting with said inlet whereby a portion of said gas may be recirculated through said path, a damper in said narrowest portion for varying the volume of recirculated gas, a hopper below said plates, means forming a skimmer extending into the outer periphery of said flow path for skimming off the heavier solid particles thereat, and means including said skimmer and forming a chamber for communicating with said hopper below said plates for conducting the skimmed ofi particles into said hopper.

5. Apparatus for separating solid particles from gas, comprising a casing having a tangential inlet and an outlet and arranged to provide a curved flow path for the gas entering said in-- let, a plurality of spaced bailie plates around the inner periphery of said path and so arranged with respect to said casing that said path has progressively diminishing flow area, said outlet extending substantially axially of said curved flow path, said plates being so disposed that portions of the gas flowing through said path are separated and caused abruptly to change their direction of flow to pass to said outlet, said path at its narrowest portion connecting withsaid inlet whereby a portion of said gas may be THOMAS B. ALLARDICE. 

